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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350bf44b71ca1f962463b112a8ed0b671e2f7f2a3e2941f0e58529e4997daaec' 
  AND token = 'UxJ5r4ikGSj+KQJELfNmEILWFmnyZTwUyg/mAWye86E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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