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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b0b7f7df7585364f943348d36a431e411b1498ef8a398f5c16dde06d2dad22' 
  AND token = '5nD9nfoI9+R1vsogTd/KFgy6T2bFI/4lyo2OEwXViF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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