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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381d2e557f4cebd24f4e0209ed936679a961a84ac9dd30f888ec72f969947f95' 
  AND token = 'FvJ9+kHXBOTZGA5UGpp7tmRcc0uyj5/B/cFsMJtnk84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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