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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51257d24739dfa195dcee6b6f70304e070e8de551e803207b2f2028db2a93ba0' 
  AND token = 'P9JQNoaJU8L0y/jlUYx8xOFN9KI6/l1/cL6yXpVVeA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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