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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c3544b09bf002d400825d36785720bee29ae8eb58c1327eb87a5714548d587' 
  AND token = 'UIlWDUA7hRUuOtERwdrHk0S2gCwIqYfbVIuF5m/fN68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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