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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c052b19829bdbb2ea791ff416134ce97c310c8f64d9898061085e1d632a5b800' 
  AND token = 'eY3J/Af5z0whN81z68+Q+O4Txv7bpRfE1bCI/2i4r6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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