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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f225e914c2b71f02c38036ab79625a46566b8cc58d01fecc696cb1c1702cecb' 
  AND token = 'z5yAZammERuWFCzm4HB3agOzwAvu7apXzchHD8GMgIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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