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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafe6142a3332f325bee1659798f8a1f1f81dba1bbc349eb24141b1c822f3123' 
  AND token = 'pVjW4GDFQ7nJHAYIjbRIN+3br7HjNFBqXcql0q7HES8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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