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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2532247a2255891548ea4fd48a5d434b11cc02da0f8d5729b4cf3c23f25c98' 
  AND token = 'dTscLv5pH6ijfqOl+OKm7cCGjUYdjBCwYjZNenDZ5Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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