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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba3f70414df457da60eb746f08db73d55701f18d165b7974415f9023c8515ae' 
  AND token = '6dm2laVb5jAFQP5vQWKjSDZ9Hanlr/PdHQltKe2YiIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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