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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbfc31c8d98022ccea08de7beaecae6baeb513e56537ef32951d337c5856ad1' 
  AND token = 'RhH9zBtxF0rN32eTbIugDtb+/LO+RljPYIVrY8BysFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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