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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd1908e31b3beaa29b338cc23675cb60d97b83ecd94783a959d03379ff27a13' 
  AND token = 'dNNw4+ebHwbM69W4dR+OE6Gy9cGSoRSEvSdTr4d9ebI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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