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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5c376ea2924d4cb192dc3742899c04fad41464d2c8f85c3676ef262da30e21' 
  AND token = 'jcSV7NCtLLixMNLVmz6S8yF3S1FAZi8SrOiAz3pgrSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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