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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f3957907226785ed2b82f18cc761feb03da244e5b87304d594f866ab9f7530' 
  AND token = 'Qxw6FZFbNi7uc3A0khu30nGI2AmnMh8iyn1jKJ4XX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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