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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712f8491d6bcd432d17021b262a60a07a88ced569b4d4aee4fb4190711043ad3' 
  AND token = 'v5UB3nMkGUExBNbpKcMjhdRQZ4YqKbY2HYPFRUY+NN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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