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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd6b2d6c8bded147f01e10d3f7be9dec5cb2d6315e5c5de5262b23b5cd729ac' 
  AND token = 'cou2PciX3tIWaYOkc0zMsFam2nMKWf6sga5iVdIdxfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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