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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13befb9dd0955ae38abb95494282d630a89f6cdb373c375d1ab2dd74c25700b4' 
  AND token = 'v+TnZeL/Ujz/enH/HF88mKBN9rskMS93Y1icfjnKH24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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