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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13deb2cb240c7df64b273e6399b95dba8b3b8734eb784afc8483393c10d2c86c' 
  AND token = 'M+toLkhyN0+4aB69SVQMHysMy/9p5t79XLjQ88uCowk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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