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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d20ab49f3bb379ac888ba694dd9bd49ceb8fa19d69f16242f0b7d888185d25' 
  AND token = '91WpZAir7Pwca/pkE9HTdCQwhx17fvcv19wrLQux7n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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