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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c00c7156dbf6769b39c042c41730a0969c431b4c4d1ffee18dbfb5a98338fea' 
  AND token = 'kl3m1vh6FpUSe45EGCBRxHKVWs88WjehCVlGpBBgjNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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