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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e04714b2071d4e76e6960032ba4a8440dbdce9289da3f0fc16660805902eecf' 
  AND token = 'ydMsUSvIAvJ5ehs9Nm7SJq47DROI3RdiM0xdshbvBuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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