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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f147365d982889275c206df247e5d22a2a46f1b29687474a145b49021cd5b0' 
  AND token = '7i3S65fiNAVG9OojvkUbtgZ2rS2JmVhsH3uerglzUHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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