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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcd618ce5b4ba566f60ef101fe2dbd5b01ac7792dac92b83d82c665d48103cb' 
  AND token = '2EUw7gggFmYPz3apmzrk7TutG5O3jeYxsqLW7ERyns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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