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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1b9ac05e9fcc58b76a3d31b421b28f88c390918b924081fff719ea49a5c71e' 
  AND token = 'HESI9ErDCguOlb7f8875KalXhfAUTHa18t8WHbaADXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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