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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d48302ee6e5d32cfcd5a2430a2cb1e6d51b3656185697060c6576947e63b84d' 
  AND token = 'TpCNvLPFhO/hMyOgDU5VvZSUSlaOU3q7pVApn0iNHhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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