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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ec9b2ee0fdf266d6e42f685678cf515c5472c05537d803d9f155a905a180c7' 
  AND token = 'BeAeVaoDkGxQXytbYebpEELOO6ZioHy46Ro6qrwvBFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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