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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28314cbefffd86b46667a06879ec047c8f7d0ffa8399f5c1fd2857097e908a4' 
  AND token = 'mcCLcxkCdF7Kqk5od6fTJ19QVrT7NZhcCewnEMBfmxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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