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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be41622477fd84c451279fe5d757779950e596a58a0a8da983f4574c9a3b704' 
  AND token = 'OIZiWti9CaO4/TcAOt1v6qfiQfS8+7QdgN3XPtbE5lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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