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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f41594c42f1ac7ebfb934649eae9a65de25d45df3d737fae3c093ff10fce1d' 
  AND token = 'WeielbmCJjKeBw0aXHJyUjj1sZ0RuZyQ/QUN3qv420M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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