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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f14167f385aea36fb22232757d5ccdd3098a8c23cb3b9b37668f3d09e0034e6' 
  AND token = '1WN8tYbefeufk6y8u0EMBA1jCFm/oQuKG/V+bebZgfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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