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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd02484dd99f89189a3f1db45b92edb9fd3b5207ea7fc9b953f650e853cdfba8' 
  AND token = 'uN78zFzDQjeciqs20mxnK5Tl564o5jgxrL5DIA/ETv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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