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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9259093ab197a7fc1fcd5a4ed2ef25634bc390e0318bd8c99591462032cf755b' 
  AND token = '6MldqZxaD+9IdCcB1c7g64Ui7oZ1RNUZ8mc6Fe7uuqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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