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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2510a83caf629ff8eb86b3ed290257851bae39751a8e238d7d2dce4d39e355e3' 
  AND token = 'uNXTylJuzi7mFtZNkBjnx6blsdC2R7YkKpi9l1jglB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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