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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82fcb0b9cf1a90446d6833b12c4f8d8c0c504516e7236d1bac1a02a59d2f15b' 
  AND token = 'iu9LFVS9sX23yN1o4HByp8e+OxoUatjGB0Jir4N4mO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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