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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbe2923a989f55e4e6dc88c0ee8356ab8b5030086657878dc0a40ef21130f02' 
  AND token = 'QDPJbbKLPDj9ssj7QFxqiaY4kErOvPSWEB9IlroJ+sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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