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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dd2e71e99c1ef09063757ccee3008a05474d05f4cd16a8ac87c3af540f8e87' 
  AND token = 'Fsa63RDLBZiwQ7XJmIjkjbv0OQ44nj01DEI6tcbyh64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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