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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c8190cc2506e8d57459a4e9d1a1aace93ff30aeb915c336a3c3f4ea86d4ac1' 
  AND token = '2Yak4VJkKkp8PPIRr750m50xqakS88bP2cstc6ODh+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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