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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083f1965860f0c1a72cd33d5ce743e0f9f8cdd932b5cc207c5c04fe316841500' 
  AND token = 'DcVRz5GVabX65f2YReyV3G76OKaFiEDDD9xq4dTLfNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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