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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b830611526c651edccd998ebd5421cedbd3566f7f9c8cedb52d402111de2c89' 
  AND token = '4S0G+4/0N4hzEKt5owHdeKjbm4DF9H0XnW8ekOv/VBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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