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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c92eebf1f99509a4f55311e606d2ef76a1898bfc36a2320dc9d7a6503c79a4a' 
  AND token = 'knT/6fBZ/4dO5IEF1mfY+8IPQF59O9PIsJurakLGUvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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