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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2716625139852cec48c82c1c70f81717150e094608e87ffbb8cc8b804aa7633' 
  AND token = '+LjXseHi2GxS5re3+fkPWQ/14fzol17oMo8FeICBKbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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