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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bf50832e3bded4852ffb4ca3378738bb9e1155e513629435963eb7a1417517' 
  AND token = 'CB9sACeoztDWPT685JLymQIjp47OIqnzg0qWtHs4zEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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