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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ea8d10527a3131f9b8b3d7fa4e080c3e7ed211d2c2e4cdb82ea22b5c0ac3d8' 
  AND token = 'TfhVzjb/VBWUvpYQTj014Pdo98vlGHfiMOPRd39HYi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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