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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60eb0d2a9c6753d037bffc1815e5945e9fb7ac99c6ababe63538764046c9b251' 
  AND token = 'Wgs67VkY9TXJtU46w5Rx7ZFN8sOv4GnWWgvC8U0OZEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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