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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe03e0419104f28acfcc4c0e753bc77f776f358ff444e4b62d5074412631e112' 
  AND token = '+MUypO7DCGaTLHSXZNavJHN0v4RU94GIsAaYeMxQLbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}