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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2ae8437736b0937ff23be3af6f5c596ac1ba270e5aad641e5e98069b5a23a9' 
  AND token = '58oakxVXIjF/YziVcezh4vZckqHoLyA6ItcShqNGKu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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