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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8557b4e2df1065613eb400f353d3592a140e6bb085d8d1b3fb86f74e0c14373b' 
  AND token = 'u+eEzSwLNGtsu+6f+Wk07p0npenAPiEfyb7xCstuYls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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