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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ed98b5a1418b13f26f0cfb2ff7737a5b71d302cea3fc8a3f2eb9d168f6080d' 
  AND token = 'wwKlZXam726FilIahQ/rv7ReOYjw3v7wbTAVh3OXq6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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