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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f64a854dd714ad651c69c3ac7d418be98703ad22573ec11ba7fa95a14c99f17' 
  AND token = '/6rAdMK5NRGWm1Z5+dEnr7bHUEq2hV8D2//V0droLYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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