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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c0910b302eef3b30aec8d2130aa5d71981313e1285bd3a842ae75b2de4484a' 
  AND token = '6iN9Ed7jZUJIuPrLLUgvE0Xee9sQS0Ul0Ia31T2fnV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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