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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68efc5b47d7fd1eb2ced4d03c92f39cac301de9c36d4481acc636b2a621652f5' 
  AND token = 'o19mr2g9Q0DQHC69YH9vHIiwUAVVre6CyyVDQeUOjDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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