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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a05a15679abe092da0b91d1edec20509547c71ef882aaeef2924300da3af233' 
  AND token = 'h5EvVakkDDTsN73+uXH5V4B1lgEfU+ONU7uvuTxWivE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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