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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472db682e400c9c00752d2c7c68ea830d14bdf82f7c832e73a4740770568fcbe' 
  AND token = 'OOX4lvt+Hyo4Tsc5QSqOyO9QUWnbbToytq9m/Y4rxMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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