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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8908791a11c77094bac13295f44607a2744f49d3ac5b9611d8cef791317bd60' 
  AND token = 'jopliIog0qgAHHyH/8COlesu7taGIsg5awdslh8wJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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